Apple is updating its business terms in the EU to allow developers to link to external payment systems or promote offers form other platforms that do not use the built-in iOS payment system.
But these options will only be available to developers who agree to the updated terms, and Apple will still be taking a cut of each purchase.
In a post on its developer support website, Apple explains that it will claim a 5% 'initial acquisition fee' on any digital goods and services purchased during the first year after an initial install. This is for new users only and will not apply to customers already using the app before the new link out options come into play.